Maca Root Benefits for Men: Libido, Fertility, ED Support

If you’ve been scrolling through supplement forums lately, you’ve probably spotted maca root popping up again and again in conversations about men’s health. Guys are asking whether it actually helps with libido, whether it stacks up against something like Viagra, and whether it might do something for fertility. The claims range from modest to wildly optimistic. So what’s the real story when you pull back the marketing and look at what the actual studies show?

Libido Boost: Potential enhancement per Healthline · Erectile Dysfunction Support: Eases symptoms per Healthline · Male Fertility: Enhances per Healthline and LloydsPharmacy · Sperm Quality: Improves per Biogena · Energy Levels: Boosts per MedicalNewsToday

The table below summarizes the essential facts about maca root as researched in clinical studies.

Is maca root better than Viagra?

This is probably the question men ask most often when they first hear about maca, and it’s worth addressing head-on because the answer matters for anyone weighing options. Maca and Viagra work in fundamentally different ways, so “better” depends entirely on what you’re trying to achieve.

Viagra (sildenafil) is a PDE5 inhibitor that increases blood flow to the penis by relaxing blood vessels. It acts quickly, typically within 30–60 minutes, and its primary job is mechanical: enabling an erection when sexual stimulation occurs. Maca, by contrast, is an adaptogen that appears to work through neurotransmitter pathways and hormonal modulation. It does not function like a prescription ED drug and should not be expected to produce the same immediate physical response.

How maca compares to Viagra

The systematic review in the Journal of Men’s Health found maca has positive effects on erectile function in men with mild ED, with a mean difference of 1.13 points on erectile function scores. That’s statistically significant but modest compared to PDE5 inhibitors. A 2023 RCT reported IIEF score improvements of 14.00 points in the maca group versus worsening in placebo (PMC NCBI), which is more substantial. Importantly, maca does not change testosterone, estradiol, LH, FSH, or prolactin levels, suggesting its effects operate through different pathways than hormonal therapy.

Time to see effects

One area where maca differs sharply from Viagra is timeline. PDE5 inhibitors work within hours. Maca requires patience. Most studies show meaningful effects after 8–12 weeks of consistent supplementation (Dr. Will Cole). The 2002 study confirmed maca improved libido in males after 12 weeks without altering testosterone levels, pointing to a gradual adaptive effect rather than a direct pharmacologic one.

What happens when a man takes maca root?

When a man starts taking maca root consistently, the research suggests several things may happen — but the timeline and degree vary depending on what outcome you’re measuring. Here’s what the human studies actually show for male sexual health.

Effects on libido and energy

The libido data is among the strongest for maca. A 2023 RCT in eugonadal men with late-onset hypogonadism symptoms showed that maca significantly improved AMS (Aging Males’ Symptoms scale), IIEF (International Index of Erectile Function), IPSS (International Prostate Symptom Score), and ADAM questionnaire scores after 12 weeks (PMC NCBI). The ADAM positive rate dropped from 70.7% to 56.1% at 12 weeks, meaning fewer men screened positive for androgen deficiency symptoms.

Gonzales et al. conducted an RCT in 2001 with 57 men with low libido, giving them 1,500 mg maca daily for 12 weeks. Sexual desire increased significantly, though erectile function itself did not change in that particular study (Ubie Health). This illustrates an important point: maca may boost desire without directly improving mechanical erectile function in all populations. The Zenico study, however, showed that 2,400 mg maca daily over 12 weeks improved erectile function in men with mild ED, with 24% reporting much better erections (Ubie Health).

Fertility improvements

For men interested in fertility, the picture is more nuanced. A 2020 study found that 2g maca daily for 12 weeks improved sperm concentration but not motility in men with low sperm count (Healthline). A pilot study with 20 men showed improvements in both sperm count and motility over three months (Hims), while another pilot involving 69 men with poor motility and count found that 2g maca increased sperm count after 12 weeks but did not consistently improve motility.

The pattern across studies suggests maca may support sperm concentration more reliably than motility or semen volume. Men dealing with specific fertility challenges should discuss maca with a reproductive specialist rather than assuming it will address all parameters equally.

Does maca root increase size?

This question circulates widely in supplement communities, and it’s worth addressing directly because the answer is straightforward based on the current evidence: there is no direct research showing maca root increases penis size in men.

Claims vs evidence

A search through clinical trial databases and systematic reviews on maca reveals no studies specifically measuring penis size as an outcome. The research focuses on erectile function scores, libido ratings, hormone levels, and sperm parameters — not dimensional measurements. Maca’s proposed mechanisms (neurotransmitter modulation, adaptogenic effects, circulatory support) do not align with a biological pathway that would directly increase genital size.

Related benefits

What maca may indirectly support is erectile quality and sexual performance, which men sometimes perceive as improved function or size perception. In the Zenico study, 24% of men with mild ED reported much better erections at 2,400 mg daily for 12 weeks (Ubie Health). Better erections — firmer, more reliable — may create the subjective impression of improved function even without anatomical change.

The catch: if you’re looking for evidence on size, you won’t find it in the maca literature. Anyone claiming otherwise is extrapolating beyond what the studies actually show.

What is the downside to maca?

Maca is generally well-tolerated in the doses studied, but “generally safe” is not the same as “perfectly safe for everyone under all circumstances.” Here’s what the safety data actually shows and where the uncertainties lie.

Side effects

Most human studies report no serious adverse effects. Occasional mild side effects include stomach upset, digestive discomfort, and rarely, headaches. The PMC review of maca for SSRI-induced sexual dysfunction noted no severe adverse events across multiple RCTs (PMC NCBI). The 2023 RCT on late-onset hypogonadism similarly found maca safe at doses up to the studied range, with no severe adverse events reported (PMC NCBI).

Daily use risks

The research consensus on long-term daily use is honest about its limits. Human studies show modest benefits for libido and mild ED, but small sample sizes and short durations — most trials run 8–12 weeks — limit how definitive we can be about extended use (Ubie Health). The 2023 RCT on late-onset hypogonadism ran 12 weeks; studies on fertility parameters similarly span weeks rather than months.

Long-term safety data is genuinely sparse. Hims notes that more research is needed specifically for the fertility claims, and the mechanisms of action remain incompletely understood. Men with underlying health conditions, those on prescription medications (particularly hormone-related drugs), and those with chronic health concerns should consult a healthcare provider before starting maca.

The trade-off: maca offers a relatively low-risk option within studied dose ranges, but it’s not a substitute for medical evaluation, and the evidence base simply doesn’t extend to multi-year safety conclusions.

What is better, ashwagandha or maca?

Both ashwagandha and maca are adaptogens that have gained traction in men’s health circles, but they target different aspects of male wellness. Choosing between them — or deciding whether to use both — requires understanding what each one actually does in the body.

Key differences

Ashwagandha (Withania somnifera) is an Ayurvedic herb most studied for its effects on cortisol regulation, stress response, and testosterone. The research on ashwagandha for men shows fairly consistent benefits for reducing perceived stress and improving metrics related to stress hormones. Some studies also suggest modest testosterone-supporting effects, though the evidence is more mixed than supplement marketing often suggests.

Maca, by contrast, has a more specific research profile around libido and erectile function. The 2023 RCT showed improvements across multiple sexual health metrics — IIEF, AMS, IPSS, and ADAM scores — after 12 weeks of maca supplementation in men with late-onset hypogonadism symptoms (PMC NCBI). The evidence for ashwagandha on sexual function is thinner and less consistent than the maca literature on this specific outcome.

Best for men

If your primary concern is stress, cortisol management, sleep quality, or general energy tied to adrenal function, ashwagandha has a stronger traditional and research base in those areas. If your primary concern is libido, erectile function, or fertility support, maca has the more targeted clinical evidence. Healthline notes that maca and ashwagandha both support male vitality, but through different pathways — cortisol modulation versus direct sexual function support.

For men dealing with both stress-related low libido and direct sexual function concerns, some practitioners use both, but the combination lacks specific clinical trial data. The practical consideration: if you’re going to prioritize one, match it to your dominant concern.

This comparison table breaks down how maca, Viagra, and ashwagandha differ across key metrics relevant to men’s sexual health.

Maca root presents a genuinely interesting option for men seeking natural support for libido, mild erectile dysfunction, and fertility — but the evidence comes with honest limitations. The 2023 RCT results are promising, particularly the 14-point IIEF improvement in men with late-onset hypogonadism symptoms, and the systematic review confirms statistically significant effects on erectile function in mild ED populations. At the same time, the sample sizes remain small, the durations short, and the mechanisms incompletely understood.